Java中AES的加密解密算法（項目中可以直接使用）
今天給大家分享一套加密解密算法，可直接使用。需要更多實用小代碼的可以關注我，我會持續更新！
package com.keenlycms.common.util;
import java.security.AlgorithmParameters;
import java.security.Key;
import java.security.SecureRandom;
import java.security.Security;
import java.util.Arrays;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class AES128Util {
//算法名
public static final String KEY_ALGORITHM = "AES";
//加解密算法/模式/填充方式
//可以任意選擇，為了方便后面與iOS端的加密解密，采用與其相同的模式與填充方式
//ECB模式只用密鑰即可對數據進行加密解密，CBC模式需要添加一個參數iv
public static final String CIPHER_ALGORITHM = "AES/CBC/PKCS7Padding";
//生成密鑰
private static byte[] generateKey(String aesKey) throws Exception{
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
/*
KeyGenerator kgen =KeyGenerator.getInstance(KEY_ALGORITHM);
kgen.init(128, new SecureRandom(aesKey.getBytes()));
SecretKey secretKey = kgen.generateKey();
byte[] encodeFormat = secretKey.getEncoded();
SecretKeySpec keySpec = new SecretKeySpec(encodeFormat, "AES");
return keySpec.getEncoded();
*/
return aesKey.getBytes();
}
//生成iv
private static AlgorithmParameters generateIV(String ivVal) throws Exception{
//iv 為一個 16 字節的數組，這里采用和 iOS 端一樣的構造方法，數據全為0
//byte[] iv = new byte[16];
//Arrays.fill(iv, (byte) 0x00);
//Arrays.fill(iv,ivVal.getBytes());
byte[]iv=ivVal.getBytes();
AlgorithmParameters params = AlgorithmParameters.getInstance(KEY_ALGORITHM);
params.init(new IvParameterSpec(iv));
return params;
}
//轉化成JAVA的密鑰格式
private static Key convertToKey(byte[] keyBytes) throws Exception{
SecretKey secretKey = new SecretKeySpec(keyBytes,KEY_ALGORITHM);
return secretKey;
}
//加密
public static String encrypt(String plainText,String aesKey,String ivVal) throws Exception {
byte[] data=plainText.getBytes();
AlgorithmParameters iv=generateIV(ivVal);
byte[] keyBytes = generateKey(aesKey);
//轉化為密鑰
Key key = convertToKey(keyBytes);
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
//設置為加密模式
cipher.init(Cipher.ENCRYPT_MODE, key,iv);
byte[] encryptData= cipher.doFinal(data);
return bytesToHexString(encryptData);
}
//解密
public static String decrypt(String encryptedStr,String aesKey,String ivVal) throws Exception{
byte[] encryptedData=hexStringToByte(encryptedStr);
byte[] keyBytes = generateKey(aesKey);
Key key = convertToKey(keyBytes);
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
AlgorithmParameters iv=generateIV(ivVal);
//設置為解密模式
cipher.init(Cipher.DECRYPT_MODE, key,iv);
byte[] decryptData=cipher.doFinal(encryptedData);
return new String(decryptData);
}
/**
* 十六進制字符串轉換成數組
* @param hex
* @return
*/
private static byte[] hexStringToByte(String hex) {
int len = (hex.length() / 2);
byte[] result = new byte[len];
char[] achar = hex.toCharArray();
for (int i = 0; i < len; i++) {
int pos = i * 2;
result[i] = (byte) (toByte(achar[pos]) << 4 | toByte(achar[pos + 1]));
}
return result;
}
private static byte toByte(char c) {
byte b = (byte) "0123456789abcdef".indexOf(c);
return b;
}
/**
* 把字節數組轉換成16進制字符串
* @param bArray
* @return
*/
private static final String bytesToHexString(byte[] bArray) {
StringBuffer sb = new StringBuffer(bArray.length);
String sTemp;
for (int i = 0; i < bArray.length; i++) {
sTemp = Integer.toHexString(0xFF & bArray[i]);
if (sTemp.length() < 2)
sb.append(0);
sb.append(sTemp.toLowerCase());
}
return sb.toString();
}
public static void main(String[] args) {
//明文
String plainTextString = "B5F7E21EAB2C6FE119DD9AC5E38187A5";
System.out.println("明文 : "+plainTextString);
String aesKey="S9u978Q31NGPGc5H";
String ivVal="X83yESM9iShLxfwS";
try {
//進行加密
String encryptedData = encrypt(plainTextString, aesKey,ivVal);
//輸出加密后的數據
System.out.println("加密后的數據 : ");
System.out.println(encryptedData);
System.out.println();
String data = AES128Util.decrypt(encryptedData, aesKey,ivVal);
System.out.println("解密得到的數據 : " + data);
} catch (Exception e) {
e.printStackTrace();
}
}
}